Rated 3 out of 5 stars
Really great add-on.
There are a couple of glitches though:
-minimize, restore and close button disappear (I'm using a custom theme)
-When right-clicking the nav bar appears
-I use auto-hide bookmarks add-on, which doesn't work with this ( https://addons.mozilla.org/en-US/firefox/addon/autohide-bookmarks/ )
Keep it up
Do you still need the auto-hide bookmarks with this enabled? You can have the bookmarks toolbar always visible and it'll get hidden away as well. The right-click now only shows the nav bar if you click and hold now in v5.